Ring 2 (リング2, Ringu 2) (1999), directed by Hideo Nakata, is the sequel to the Japanese horror film, Ring.
Ring was originally a novel written by Koji Suzuki; its sequel, Rasen (a.k.a. Spiral), was also adapted into a film as the sequel to Ring. However, due to the poor response to Rasen, Ring 2 was made as a new sequel to Ring, not based on Suzuki's works, and thus ultimately ignores the story of Rasen.
Ring 2 takes place a couple of weeks after the first film, directly continuing the story and features most of the cast from Ring reprising their roles.